Star Destroyers are capital ship in the fictional Star Wars universe. The Imperial Star Destroyer, which first appears in Star Wars Episode IV: A New Hope (1977), is "the signature vessel of the Imperial fleet". The term "Star Destroyer" also refers to other vessels in the Star Wars universe.

In the original draft scripts of the movie that would become Star Wars, the term "Stardestroyer" refers to two-man fighters flown by what would become the Galactic Empire in later drafts. Industrial Light & Magic built a 91-centimeter shooting model of the ship for A New Hope; they built a 259-centimeter model, equipped with internal lighting to provide a better sense of scale, for The Empire Strikes Back.